Terraform a planet all you like, it didn't move in distance away from the Sun (Main heat source) and you've literally just said yourself terrformation has no effect on gas, which is the reason heat doesn't escape Venus.
I didn't say you could terraform the Sun either, the only way the Sun will be playable is if it's on some kind of space station (Given this game blatantly ignores heat)
EDIT: You're aware I meant the Sun wouldn't be playable in my first comment, right?
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I did. But just thought to give my opinion. Space station would work fine though. Come up with a metal which doesn't metal or some Cabal bullshit and create something near the sun.